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How do you determine "at the lands" by your method?

 
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  #22  
Old 05-24-2004, 05:07 PM
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Re: How do you determine "at the lands" by your method?

Jeff

You are the guy I had in mind when I posted my question. I remembered you posted over on BR about the meplat trimmer.Thanks for chiming in. Your 1/4 moa suggests about one inch more drift at 10mph. Not much.
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  #23  
Old 05-24-2004, 09:34 PM
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Re: How do you determine "at the lands" by your method?

Len,Your right about the drift ,i will give away drift anytime for a gain in vertical dispersion(VD)..My range in tropical Northern Australia is where mirage was invented so vertical will always be a hefty problem for groups ..The toughest part of long range load develpoment will always be the VD. IMO..Lookin back at one of your posts u mention the chrono and bullet qualifing,i sorry i don't have that info as i don't use a chrono for load testing..Your question on the differences between sorted and unsorted is a tough one as i have been basic qualifing (weight, dia,base to ogive and AOL) since 1997..I recently coached a new guy in Light from a best of 3.5in group to a 1.8in at 550yds buy helping him set the gun and the loads and the basics on the bullets..The next step is to totally set upon the cases and the Sierra bullets to get it better..These particular 168 7mm Smks were as bad as i have seen in a factory projectile(7 thou in base to ogive and 30 thou in AOL in a single box)...Hope this helps..JR..Jeff Rogers
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  #24  
Old 05-24-2004, 11:05 PM
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Re: How do you determine "at the lands" by your method?

Very wise words from BountyHunter. Buy the tools he states and follow the prescribed steps and you can't go wrong. The only other thing I'd add that I didn't see (maybe it is in there somewhere) is to make sure your sizing die is centered and adjusted correctly. I had a forster sizing die with the split lock ring and occasionally the die would be slighty crooked after tightenning the ring, thus causing runout. Me personally, I just took a ring off an RCBS die and after twisting the sizing die firmly onto the shell holder to allign it, I would tighten the lock ring. No more problems with run-out. I am a big fan of forster inline seating dies (regular bench rest dies). They are the father of the redding inline dies which came out as soon as the patent on the forster dies run out. You pay quite a bit more for the redding mic dies than you do for the forster dies. Personally, I don't use the mic dies. Also, the configuration of the seating plug in the forster (as well as for the redding) acceptsmany more low drag bullets than do RCBS (built off speer bullets) plugs and hornady plugs.
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  #25  
Old 05-24-2004, 11:45 PM
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Re: How do you determine "at the lands" by your method?

Speaking of ogive sorting...have any of you serious 1K guys done testing to see how much your 1K groups benefit from such sorting? Would 1/8 moa be a fair guess?

2nd ogive sorting question...can you see measureable chrono velocity differences? For example does the ES go down when using ogive sorted bullets? If so, how much.
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